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The climate of Montana (United States of America)
The state of Montana is located on the border with Canada. In this ‘Treasure State’ Indian Reserves, mountains in the west and several large lakes dominate the landscape. The western part of Montana is part of the Rocky Mountains. The eastern part is much flatter, many forests can be found here. In the mountains many beautiful valleys can be found. Because of its varied landscape Montana attracts many nature lovers and eco tourists. Montana is the fourth largest state in the United States. Because of this the landscape is very diverse and the state has several different climate types. The central part of Montana has a cold steppe climate (type BSk according to the Köppen climate classification). In the western part a moderate continental climate changes into a high mountain climate via a moderate continental climate. Large differences in precipitation figures can be recorded as well.

On average Montana gets 400 millimeters of annual precipitation. However, the valleys in the eastern part of the mountains can only record 300 millimeters of annual precipitation. The city of Lonepine for instance has an annual precipitation figure of 291 millimeters and the city of Deer Lodge can record only 279 millimeters of annual precipitation. However, in the mountains high precipitation figures can be recorded. Average annual precipitation figures of 2,000-2,700 millimeters (Grinnell Glacier) are not uncommon here. Summers in Montana are fairly warm, with the exception of the highest mountain peaks. In the city of Billings maximum temperatures of 30 degrees Celsius (86 degrees Fahrenheit) are not uncommon in July and August. Winters are cold in Montana. From December till February subzero temperatures, snowfall and ice forming on the lakes are not uncommon. When there is a strong northerly current ice cold air from the Arctic is supplied.

Climate information of places in Montana
The climate information given on this page is only brief. Specific information on weather and climate can be found on the pages per region or city. The following climate information is available for Montana:

Great Falls
Rocky Mountains
Yellowstone National Park


Climate information
Throughout Montana several climate figures and temperatures can be recorded. The figures below are for Helena and cannot be seen as an average for this state. For climate figures for other places and regions in Montana please, visit the individual climate pages.

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January -1 -13 4 10 n/a
February 3 -10 5 8 n/a
March 6 -6 7 10 n/a
April 12 -2 8 9 n/a
May 18 3 9 11 n/a
June 23 8 10 10 n/a
July 28 10 12 7 n/a
August 28 10 10 8 n/a
September 20 4 8 7 n/a
October 14 -1 7 6 n/a
November 6 -7 4 8 n/a
December 0 -12 3 9 n/a
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm
= 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate tables are useful but they don’t give an overall picture of the climate and possible weather conditions during a period of time. How high the chances are of hot or cold weather or hurricanes can often not be found in these tables. This is why we offer extra climate information per month. The figures below apply to Helena. For climate figures on specific regions and places please, visit the relevant individual climate pages.

chance of
(very) hot


chance of
(very) cool
chance of

chance of
chance of
sunny days


click here for the explanation of the symbols

The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.


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